On a related note… I couldn’t find documented when a previous day’s analytics data is expected to be available through the Analytics API.
Perhaps in the short term we could mitigate this problem by moving our scheduled reports to another less busy time of day.
For the record, we begin running these at 6:00 AM EST/EDT.

Due to increased latency with the async analytics endpoint POST stats/jobs/accounts/:account_id, there has been a drop in success rate starting at 2017-08-19 05:45 UTC. We are currently actively investigating the root cause of the issue.